YOP Poll < 6.3.1 - Author+ Stored Cross-Site Scripting via Options Module

The YOP Poll WordPress plugin before 6.3.1 is affected by a stored Cross-Site Scripting vulnerability which exists in the Create Poll - Options module where a user with a role as low as author is allowed to execute arbitrary script code within the context of the application. This vulnerability is due to insufficient validation of custom label parameters - vote button label , results link label and back to vote caption label.